What should I do if I fall for my unemployed childhood friend living next door?

You were cruel back then... because you trampled on your first love. (Taesan's Perspective) Episode

My first love? Haha. Who are you asking...
Of course it's the female lead, right?
The behavior is like that too. At first
I thought it wasn't me, either.
But I didn't know my first love might trample on my first love.
Actually, regarding high school, I went to Seoul Performing Arts High School and the female lead went to Hallym Arts High School, so we couldn't meet for a while, but we ended up entering the same school.
I asked Liu and she said she got a boyfriend.
I still like you, but you miserably trampled on my first love.