its kinda late into the story which makes me think this is gonna happen in side stories or something, but I think that if there were to be a 2nd couple, it would be Do Jeonsu's bestfriend with the time thief, Im so sorry, Im horrible at remembering names, but I lowkey think they could get together possibly later.
this is like a shower thought but given that they eventuality get married in this lifetime, who would propose first?= yeon , =Kihoon, (this is just to make it easier to count)