Great casting choices, all of them were a good fit for their character. Doo Na is such a natural she always stand out. Glad to see Cha Tae Hyun in more main roles. It's hard to find a mature drama that isn't overly melodramatic or infested with tropes. It started off as a slice of life to get us accustomed with the characters, their backstory and their current status. It took until the last third before the characters began to spill out their guts and get serious. Aside from the supporting cast, all of the four leads were elegantly written, well developed and interesting on their own. It's a…