I think that Yoon should've been end up with Taejoo! They could have come back together after explaining everything and pls sacifice 9 years long relationship (+5 years tho) for not even 1 year? That's not real, Taejoo in real life would just break up with Youngwoo and come back to Yoon, come on! The true love for the person you have been with 9 years and live with 30 years couldn't be stopped by something like that!