Its been so long I read this, if I remember its childhood friends with age gap and the ML really obsessed with MC .
also the sub ML (classmates) who likes MC try to seperate MC with ML cuz he jealous and that is where the misunderstanding point come, after years later MC an adult and he works for ML company (he dint know btw) MC havent see ML for so long after he run away cuz due to the misunderstanding from sub ML make for MC to run away and hate the ML.
MC is a really good character tbh, he really rational after he become an adult, and there's a redemption arc from Sub ML cuz of his evil thing lmao
Anywya its a really good simple happy ending story.

Feels like speed running all the plot drama, all the key point plot is here
Unrequited love, love at first sight, reunion, misunderstanding, obsession, regret, forgiving, childhood friend, new love, miscommunication, Trust with each other, rival, and some little drama to spice it up.
I really like this short story with happy ending.