
If you are reading this, this webtoon is finished and it's up to only chapter 47

Since you have read, might as well corrected you. The last chapter is not about the police's past. It's actually the afterwards of the MC and other characters. The police is dead and his guardian (blue lion) possesed MC, and he's physically turned into the police guy. Sadly just like we saw at the last page, it seems his friend got possesed by evil guy's spirit or something. Well just your typical horror's movie ending.
All of them are so adorable
Love them so much