I started watching this because I wanted to see Lee Pil Mo (who played Kook Cheon Soo) after seeing him in Pinocchio playing an excellent role as reporter Hwang Gyo Dong. He hasn't had many (any?) lead roles but he really stood out as second male lead here. I initially cared about his role, but as someone else has said this in their review, ended up caring about everyone. I found the arguments between the two leads a little hard to get into at the beginning, and so being interested in Lee Pil Mo was a very good distraction. But it always takes me a couple of episodes to get into things and the Emergency Couple's romance and the way they rediscover it, and navigate discovering changes (i.e. character changes from the time after their relationship and during their time in the ER) and with that adjusting how they see each other - and with a good amount of other things going on at the same time - was really lovely. The Mother-in-Law's acting was initially pretty extreme/exaggerated too, but it calms down over time. I felt like it was a drama that softened and matured over time, too. It felt like the right length - I wasn't bored or impatient at any point, and it didn't feel rushed or forced. I loved that it had an original storyline and carefully navigated a couple getting together in a way that really felt natural and enjoyable to watch.