Flowers

Little Hyunjin makes new friends, Han and Felix. Years go by and three become an inseparable trio until Felix is suddenly moved cross country from his two best friends, losing contact with both due to his parents being horrible people.

It isn't until after Felix leaves and loses that contact when Hyunjin realizes he's had the biggest crush on Felix his entire life and loves him so deeply that no one can understand.

Years after leaving and only kind of having an idea of what happened, Han and Hyunjin get the biggest shock of their lives when befriending the new kid in senior year.