High school graduation ceremony.
When my fierce rival throughout my school days
came to me and confessed his love.
It was different from what I had imagined,
but I ended up thinking that I had won.

That is, until I reunited with him years later, when he showed up with his young son.

You worthless brat...
If your heart was so easily swayed, why did you confess in the first place?
Well, it doesn't matter anyway.
It's no big deal to take someone like you again.