interesting question... My short answer is there are 3 groups that have the ability to heal me, namely FTIsland, Exo and GOT7.

The latter was the group I got into very recently, which was weeks before Eyes On You was released. If I remember it right, listening to their song "Let Me" healed me. Mind you, the version I heard was the switch part version where the main vocals rapped and the rappers sang. I cried over that video so many times, I lost count already. That made me an official Ahgase because I saw the love and sincerity in their eyes, towards their members, their music and their fans, I'm almost always overwhelmed by how genuine they are as a group and individual.

Exo has healed me in a strange way, looking at how eventful their journey was to where they currently are. All the joy and the heartaches, the successes and the downfall (minor but still) and how they live their lives and how impossibly human they are, touched and healed me in every kind of way. "Miracles in December", "Promise" and "Universe" are my fave healing songs from them.

Lastly, but the most important bias group I can ever have is FTIsland. They may never come nowhere close to the popularity of the others, but their music has already penetrated in the deepest parts of my being. Cheesy and dramatic as it sounds, but it's true. I feel so human and so real as I listen to their songs and watch them be themselves in their concerts and interviews. All the songs they have dedicated to fans are my healing songs, and they always have one for every album released. They love us too much that they have this strong need to reiterate it to us everytime and so we are truly grateful and privileged and spoiled rotten. I feel it's also note-worthy to say that from all the artists I have ever stanned in this lifetime, no other band or group or individual had the privilege to reside in my bedroom wall but them (personally it feels strange if there's a photo on the wall, staring back at me but these boys make my room homey, I love it)

Sorry I took so much of the space here and for bothering you with my long comment. It just feels so gratifying to let this all out. :D tysm

It's EXO for me. I've had really bad times over the past several years - death of family members, poor health, money, severe depression and agoraphobia (almost crippling at times). I've been into kpop since 2013 and listened to lots of bands - Big Bang, Shinee, SUJU, TVXQ, ikon, Block B, Winner, Got7, fx, 2ne1, 2pm, etc. I liked many of them, but none of them could brighten my day like EXO.

EXO brings me joy and takes me out of darkness. They can calm my anxiety but also energize me when I'm in need. All I need is to play my music (which is 100% EXO now) and I'm instantly better. Any song will do, though there are special ones for specific times. For what those guys have done for me, I'll be a loyal fan and love them forever.

Funnily enough, something happened recently that could actually be used for this situation.

It was two days ago, when I found out my crush has a girlfriend. He’s a senior of mine and a really friendly guy. I didn’t know how it happened, but I soon found myself crushing on him.
It’s really weird, because the feelings I have for him is different than with others. With others, I’m more friendly and not scared to show my actual nature; to him, I’m shy and try my best to be modest. Maybe it’s because he’s a senior, but I can never be sure, our brains work weirdly after all.
Either way, I usually wouldn’t mind if my crush has a girlfriend or is crushing on someone else. It’s weird, I know, but it’s the truth. I feel oddly happy in fact if my crush likes someone else, maybe because I feel that the person could provide my crush the happiness that they deserve while I can’t, I’m not sure. Whatever the reason may be, basically saying, I don’t mind if my crush likes someone else.
But, it was different with this one. When I found out he has a girlfriend already, I just ended up crying. I didn’t know how and don’t know why, but the news hurt me more than it should.
For the first time in my whole sixteen years of living and crushing on people, I felt like a fool. I felt so stupid, so idiotic to fall for him. A part of brain warmed me that this might be a puppy love, but I didn’t care, and now, look where I am?

I talked to my brother and a friend of mine about it, and while my brother didn’t know what to do, my friend asked what I want from my crush now: For him to like me back? To notice me? To be my friend?
I chose the last one because, honestly? I need more friends anyway, kill more of my boredom. Plus, I need better friends than my (somewhat) only female friend who now has a boyfriend (I don’t approve of that relationship, the boyfriend is hateful).
So, my friend instructed me to ask my crush to be my friend, and I felt scared.

And, this is where the K-Pop part comes in.
Recently, I have been chasing Super Junior and catching up on their old songs. Out of all their old songs (that I heard so far), my favourite is Bonamana, so I watched the MV. Funnily enough, once I was done watching, I felt more light, like a weight has been lifted off from my shoulders, almost literally.
I don’t know, but recently, even though my first K-Pop group is EXO, Super Junior has been making me feel happier and more at ease these days. Just something about them makes my heart light, and a smile to bloom on my face. It’s weird, not even EXO can do that for me.
I appreciated it nonetheless though. If it weren’t for Super Junior to calm me down that day, I might have a breakdown again before I could even text my crush. SuJu may be an old group (my Internet friend: “Most of the fans are already ” & me: “Do I look like I care?”), but they make me feel happier than EXO could in the past year I’ve known the latter group.

So, yeah, there’s my story. XP

For me, the first group that saved me was SHINee, and the second, more recently, BTS. I have had an incredibly emotional journey with both groups, and through everything they have been a constant; ultimately, the fan-life can be sad in and of itself, but I honestly couldn't imagine life without them anymore, either of them.

Super Junior, SHINee and EXO all hold that position in different times. SJ makes me smile and they provide nostalgia in some way. SHINee is like my best friend, there for all the fun and all the tears, urging me and helping me be my best. EXO are there in times of procrastination, in times of “pls let me forget this just a couple of minutes so i don’t have to be anxious”. EXO was also there in the time after Jonghyun’s death.
So - these three, although SHINee perhaps hold the most precious spot of the three.
(That said, “It’s okay” made me ing bawl)

Ive been into kpop since o3 (started w boa,dbsk (ot5) & shinhwa]
So ive had plenty as for 'healing' goes -> aside from BTS, it would be BAP

Song: With You
youtube.com/watch?v=xRRZTy0-Vn4

SNSD and BTS songs mainly :)