First of all, if you're looking for one particular, obvious reason to watch this drama, it's the chemistry between GHJ and JIS. I don't know whether if it's because of both of them are a very experienced actor/actress or what, but their chemistry makes us the audience just want to ship them until the end of the day. it's like u want them to really be a thing even after the drama ends. They are just THAT compatible w each other. they"re not awkward. the acting is superb. Kwang Soo and D.O didn't disappoint either. The OST also great. Yoon Mirae yet again w another great song after Master's Sun OST success. The storyline is also excellent. definitely worth it. Go watch this dram if you still haven't. Highly recommended!