(It is difficult) more and more to play to cool laughing 점점 더: more and more 아무렇지 않은 척: play to cool 웃어넘기다: just laugh and no more action.

아무렇지 않은 척 - it means " pretending it's nothing and that you don't care about something" 웃어넘기기엔 - it means just laugh about something and shake it off. - 점점 더 아무렇지 않은 척 웃어넘기기엔 : It's getting hard to pretend that I don't care about something and just play cool and laugh it off (cuz I care about something or it's getting on my nerve, etc) -------------------- I hope it helps!