who's the main character here? why is the cover photo not Jin (i just started)

In s1 1-27 chapters it's Jin
In s2 28-tba it's Kimoto aka boy in the cover
S2 is about to end so it'll be around 20+ chapters too.
The author wants to do 2 other seasons too (said they plan 4 in total) and mc will be Tehir and Garon.
The mc in general are the daycare boys, but aael, rim, hyehan and Charin are side. Hyehan is the villain though so that's why he gets more screen time.