The timetravel dramas always be my favourite. This is one of my favourites. Even i was confused by the timestamps of their soul timetravel (yes they don't travel physically but just their soul) , i can understand it at the end. Jeon Yeobeen really did great by portraying two characters with totally different personality (and how could she still fits as a highschooler in her 30s??? queen certified fr). Nam Siheon is also a very warming character, I gonna cry everytime I listen to the song (Gather my Tears by Seo Jiwon).. i really recommend this drama.