I don't even know BTOB as much as I know Teen Top, but I do listen to some of their songs. 

The songs that I particularly like from them are 

My Girl; 2nd Confession; When I Was Your Man; Why; Like A Crystal; Star; Hello; Hello Mello; Is This The End?

& I've watched shows that they're on and stuff, but not as much as Teen Top because I'M LIKE ADDICTED TO TEEN TOP :P

BUT EVERY TIME I HEAR NEVER ENDING MELODY.....I CRY T.T

seriously....i mean. listen to it 

1. the whole March 21st killed me in the beginning, BUT WHEN THEY SANG IT IN THE END I WAS LIKE ASDFLAIEUHFANJKVLEUSHKRAWEKJREWR

2. the tune of the song sounds emotional like the lyrics are already killing me

3. they're all like "I don't express my love for you enough...so I'll just sing FOREVER"

& I'm all like "YES SING TO ME FOREVER!" ASDFGHJKL

4. lyrics structure wise, it's actually not that poetic because it's just like one verse, pre-chorus, and chorus being repeated....BUT WHOEVER WROTE THIS WAS A GENIUS.....they obviously just wanted to kill me over and over again.

Mianhe~.....I just needed to write about this T.T 

uuunnfff, BTOB is killing me RN OTL