thank you for the question! We have thought about putting up english subtitles for the music video, but it turned out if translated from Korean to English, the lyrics will be a bit weird :/ I'll talk with Chanwoo to see if I can send the English lyrics to you :)
I've asked Chanwoo just now! :) he is currently on a trip and he said the lyrics might sound weird if translated to english, as the song actually starts with the line "There is a day like that..." - maybe would it be alright to try writing based on the tune first?:-) If it is still quite tricky to write I can send the english lyrics to you! :)
Merry christmas!