I'm never gonna grow old hit harder than it should have
Good catch. Very subtle foreshadowing from the author.
Goes to show that the gist of the ending was already quite written a long time ago. I appreciate authors who follow up on their foreshadowing even though how subtle it had been. Nice catch! All of us should realise by now that the ending does make complete sense even though how tragic it was. Sangwoo was marked for death a long time ago. Now, I wonder if there were similar foreshadowing for Bum...
So we already got a warning from this part http://www.mangago.zone/read-manga/killing_stalking/mf/m_chapter-37/pg-39/ and this one http://www.mangago.zone/read-manga/killing_stalking/mf/m_chapter-38/pg-8/
(⊙…⊙ ) Ameihjiiiiiiing...