
I didnt get the part where there are police in their school and seungho was being dragged by the police, can someone explain pls.

No that's not why the police came.. Just think about it, will the police come every time a student punches another student? Nope, that's school's responsibility and so they'll call the parents and suspend the student.. that's why his mom came to school and slapped him in front of everyone.
Btw.. Police incident happened in Ch.48 and Seungho attacking classmate in Ch.50

http://www.mangago.zone/home/mangatopic/6885847/
Yeah my take is that he went missing/hiding in the warehouse all night out of frustration for Dohyun, and police was looking for him. They found him on the warehouse in the morning (along with all the dirty things in there) and later his classmates mocked him for that, which resulted in him punching the students and even the teacher.
pls tell me that cain will have someone in future chapters because we all know yahwi and jooin will end up together. cain is so adorable, i want him to have his own happy ending. (づ ̄ ³ ̄)づ