huh?? that's not normal... if you're playing the web version, what browser and os are you using?
hmmm that's so strange. i'm not even sure how i'd go about fixing this issue. in any case, at the end of kyungsoon and numa's conversation, the screen is supposed to go black, not green. then you should be able to click anywhere to continue the story. if you ever play again, hopefully that's what happens!