I really liked the one line coz i remember playing a game called Life is strange, where the protogonist travels through time by looking at photos to save her best friend and she will face some twisting consequences at the end. The blue birthday had a similar story line which is why i started watching and i just liked how it started and how it goes on, with a romance and thrilling elements. Its a mut watch, eveyone should give a try.
Yeri's debut in kdrama was a perfect one, her character was superb and cute accent.