The series opened with such meaty angst with Lee Gun driven to deep mental unwellness by his family treating him as a second class citizen after his tragic tennis accident from when he was just a kid. His pain when he finally snapped and let his family have a piece of his mind was so palpable. It all goes down hill after the extremely ethically questionable procedure done to his brain to take away the bad memories and his personality turns into an annoying, obnoxious cartoon character. The actor can't bring any grounded nuance to balance Lee Gun out. Ju Yeon also just becomes annoying whenever she's with Lee Gun and gets worse as she falls in love with him. The chemistry for the two main couples are all mismatched. Lee Gun is actually way more interesting with his Sae Yan whose wacky personality actually levels out his cartoonish over the top behavior to something bearable. Lee Shin and Ju Yeon are also more interesting together with him having his own mental health issues that are more on the level that Ju Yeon can help with without lies and they can relate to each other better. 16 episode is way too long for this show as well, it might have been slightly more tolerable if it was maybe 10. The twist that Ju Yeon was the actual first love all along is extremely uninspired.