He is secretly in love with his highschool girl 'friend' for years 

I told you I fell for you the first time I saw you.
I knew you were my destiny.
I said to myself that you were the one. ~ Yi-Hyun
A home depends on whom you're with.
Whatever you’re like,
I’m okay with everything.
I’ll stay with you from now on. ~ Sae-Bom
Jung Yi-hyun ✘ Yoon Sae-bom ❝Their Story ❜❜ | The Finale | Happiness FMV
Drama: Happiness 해피니스 Episodes 1-12
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Personally cut video clips from every episode.
Editing is mine.
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