Responses
I was also surprised that many readers didn't know. It's been implied in many chapters ╮(￣▽￣)╭
Exactly
http://www.mangago.zone/read-manga/killing_stalking/mf/m_chapter-41/pg-39/
He basically said even the age gap. Some people think Bum is in his 30s. No, he's just 4 years older than Sangwoo, who is 23 at most, maybe younger
Funny that many readers here are so surprised that Bum is older than Sangwoo. Did you not read the early chapters? :)) There's so many chapters wherein Sangwoo calls Bum his "Hyung" which is older man/brother in korean.