"I've already loved a girl once. Love only happens once in a lifetime, and with only one person. It's impossible to love again" –Onew

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Ji Young– A person can love as many people they want, but only one or two will get a permanent place in their hearts. Love can happen twice"

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"I only want my Dad to be happy, I don't care what way it will be, I want to see him smile again" 
–Jae Hyun

Everyone has stories, some they can share, while some they can't. Every story has an interesting part, let it be simple or extraordinary.

On one side, there is Onew, an ex-celeb, now working as a vocal instructor at SM Entertainment, also a single Father to Lee Jae Hyun.

Then there is Byun Ji Young, a dorky Paediatrician at a clinic, living right next door to Onew.

Being complete strangers, they have their own works to even care about anyone else. Each have their own secrets, their own worlds, their own stories.

What if they meet with each other? Will their lives still be as it was?