I was thinking if the bracelet that TK is wearing is the same bracelet that he gave with Daon, it's like a couple-bracelets, though we didn't see that TK bought two of the same thing, and he only wears that bracelet after he confessed his feelings with Daon.
Fidda:
Who is the one shinwoo gave bracelet when he was 8th grade?
In regards to this question, I was wondering as well if it's TK, or maybe it's just a backstory of SW to be able to know that he likes guys, that he's brave enough to open his sexuality during middle school in spite of the stigma.