Cake and See-ew are close despite their different personalities. See-ew didnt really like the crowd and goes stiff in front of other people. So he distance himself from Cake at school but at home, as they are neighbor since baby, they slept together and cuddle every night, innocently.
But something feels different when Cake suddenly got a girlfriends and See-ew realize his feeling for Cake. Taking his sister advice to let his go of his feeling without taking any action, realizing that he is still young and didnt truly understand the word love, Cake suddenly needs to goes abroad, following his father. Before that Cake break up with his girlfriend as he want to spent his time left with See-ew and his girlfriend could not accept that.
And when he comes back, he finds out that See-ew has changed. Many people like and approach See-ew and that makes Cake feels jealous. It is now Cake's turn to question his feeling for See-ew.