First, the story was pretty good. Basic romance plot with a guy named Sky trying to win the heart of an old friend, Venus, who he had rejected in the past. Not outstanding, but a decent idea. Secondary couple is Venus's older brother and his boyfriend, who have to deal with learning to be partners and not just doing things on your own when you are in a relationship. Third couple is Venus's best friend and his boyfriend (who happens to be a friend of Sky) learning to work things out in a long distance relationship when they are both busy adults. All good ideas that are common relationship issues and definitely add value to the overall story. Honestly, the main couple's journey was a little underwealming in comparison to the two other relationships but had way more screen time.
Second, the cast was great. I was pretty surprised that they were so good with such a simple plot. The dialogue made sense and was well done.
Third, the music was okay. I didn't particularly love any of the songs and other than the little ditty they used for the theme, there really weren't other songs to speak of. I was not impressed, but it wasn't distracting, so it neither added, nor detracted.
Fourth is rewatch value. Well, its a pretty simple and predictable plot, so I wouldn't say it's hightly rewatchable, but it's got some pretty funny moments and some overall good storyline, so I think it has some value for rewatching if you are bored. But you probably won't go back to it again and again.
Overall): I would say it's worth a watch, but you should be careful when you watch it because there are definitely some NSFW scenes that can be pretty risque for TV. Don't watch with kids. Aside from my surprise at how graphic some of the sex scenes were (not graphic as in porn, but just enough that it was uncomfortable for me), I thought the plot was a little bit lacking for one reason. I don't consider this much of a spoiler since it was explained in the first episode, but just in case, this is a tiny bit of a spoiler: Venus was really rude to Sky in the beginning and didn't want to give him a chance because when they were in college they were really good friends and Venus fell in love with Sky but Sky didn't return his feelings. When Venus confessed, Sky rejected him, so when Sky came back later to confess that he really loved Venus and was wrong, Venus was rude and dismissive. Venus is totally allowed to not want to give Sky another chance. He was rejected and maybe he's moved on, so Sky has no right to expect anything. That doesn't bother me, even though Venus's behavior is a little over the top at first. But Venus's best friend and Sky's friend discussed this on the phone and the boyfriend says that Sky had done something wrong but had really changed. Now, unless the English Subtitles are lying to me, Sky did nothing wrong. He rejected his friend in a nice way (not cruel or anything, just rejection is naturally painful). It's not like he was a jerk or they'd been sleeping together, just basically said, I only think of you as a friend. I don't know how that is wrong. Maybe he gave mixed signals to Venus, especially when he was drunk, but people are allowed to say no to confessions. There is nothing inherently bad about not wanting a romantic relationship with someone just because they want one with you. The whole plot of the show hangs on this one point, of Sky having to work hard to win back Venus's love. Since he didn't actually do anything wrong, I felt like that was really thin. All they had to do was say they had been a couple and Sky had broken his heart by ignoring him or taking him for granted. Or maybe they could have been in a more confusing situationship, where Venus was justified in feeling that Sky had treated him badly. But to say that Sky has to work hard and Venus is allowed to be a total jerk just because Sky initially rejected his confession, is fairly lacking. I know, no one wants to make the ML a bad guy, even a past bad guy who has to change and be redeemed, but acting like he was a bad guy when he wasn't just makes it feel like lazy storywriting.