@GO_KENTA MC was an art teacher of an prep exam art school while his student got into the school for a year before passing the entrance exam into a prestigious university, who he held dear in his heart.
A year later due to circumstances they used a dating app that leads to the encounter after a year.
After the deed the MC was pondering if he'll never meet the student again (and even considering deleting the dating app) but then she gave him her contact info so they might meet again sometime.