Not sure why I had high expectations for this series... the premise of a bodyguard-son of a mafia boss is nothing new but somehow the trailer showed something that had the potential of being interesting... sadly, it wasn't meant to be.

Here is why, in my opinion:

1. Weird storyline. Sun (played by Boat) is an orphan who is adopted by Sky's father and mafia boss to donate blood every month because Sky's mother died when the doctors were unable to help her due to a rare blood condition. Sky's mother and Sky have a condition known as "golden blood" when the blood type (O, A, B, or AB) does not have any + or - rH as we all normally do, making it rH null. The condition does exist but in episode 7 they give numbers of the people with the condition and they exaggerate way too much. It is a very very very very rare blood condition so the chances of 2 persons having it in the same city and actually meeting like Sun and Sky is microscopic. But, let's overlook that...
The fact that Sky's father adopts Sun just to provide blood for his own son and then serve as his bodyguard seems a bit awkward to me. And, they've never met in person and yet both develop love feelings for each other in a flash all while being attacked by Sky's father main rival and while posing as distant relatives in school because Sky doesn't want people to know his father is a mafia boss.

2. Mediocre acting. I like Gun Napat, I really do... but he is not a good actor. We've seen him have good moments in "Love by Chance" when he made us laugh as Techno with some comedy scenes, but here when drama is needed, his facial expression remains the same when he laughs and when he cries. He tends to move half of his mouth in a weird way that looks as if he is laughing but only when you see the tears you realize he is actually crying. Plus, he screams every single time he is mad. Boat has acted in many more dramas and, being 2 years older than Gun, should teach him a thing or maybe 10 to improve his acting.

3. Side couple. Bank (played by Tenon) and Pitch (played by Sugus) are the two saving graces of this show. Tenon is making his acting debut (yes, I know he appeared in a guest role in "Lovely Writer" but this is a much bigger role so I won't count that). Sugus has plenty of experience and at 30 years old, is the oldest of the 4 male actors in this series. We get to see good chemistry between them but sadly it was not developed any further. One episode they don't like each other, then Bank starts developing some feelings for Pitch, who at first rejects him because he is insecure about his own sexuality and feelings for Bank. Then, magically, a switch snaps, and Pitch realizes he loves Bank and end up being a happy couple. It was a bit rushed and we don't get to see a lot of interactions between them (in private) as most of the time Sun-Sky or the two girls are with them. But we've gotten full BL series for secondary couples, even very badly acted BL couples (see "Don't Say No" for an example) so hopefully these two get their own series.

4. Support roles. Toktaeng and Juno (played by Jane and Apple) are the two girls who are interested in Sky and Sun. Both are very naive and don't realize that Sun and Sky are in love when Bank and Pitch figured it out quite fast. They really don't provide anything else because, for the first time in a long time, we don't get the typical jealous and bitchy girl in a Thai BL. In episode 8, both find out that Sun and Sky are lovers, both sit down and cry, and then the show jumps 6 years into the future so we never get to see their full reactions to that confession. The gangsters, lead by the two bosses, are the typical cartoonish characters we've seen in Thai BLs with all of them screaming, pointing guns, fighting, and threatening the other one without much substance. In more Thai BL clichés, Sky's father forbids their relationship and makes a deal to send Sky to study abroad and when he comes back, if Sun and Sky still love each other (despite not being in contact at all) then he will allow their relationship (something similar to what we saw in the much better Taiwanese BL "We Best Love: No. 1 for You"). Then, in another very used gimmick, we have a time jump into the future... but in this case, the time jump is 6 years! What the hell was Sky studying abroad?! After that, all the characters look exactly the same, despite being 6 years older. The girls show no signs of being angry at them and Bank and Pitch are still a happy couple.

Overall, what seemed to be like a very interesting series, ended up being just another mediocre show that, if not for Tenon and Sugus, it would have been mostly forgettable.