To be honest, I would probably have dropped this series if HeartLiMing wasn't in it. I have nothing against the actors that play the main couple, but I just wasn't really interested in them (dramatic storylines aren't really my thing). They did have really good chemistry, though.
On the other hand, Heart and Li Ming quickly became my favourite pairing EVER on a BL series (and, mind you, I've watched a few already). Their relationship is so cute, warm and unproblematic, that I could rewatch their scenes over and over and never get tired of them. There's something comforting about a ship that doesn't have any drama in it - and the only drama that happens doesn't have anything to do with them, but rather with Heart's parents and how they treat their son.
You know what, I'm not even mad we got an angled kiss. GeminiFourth steal the show every time they're onscreen together, and they bring a lot of dimension to the characters they play. Gemini's acting is especially commendable, because he had to convey the emotions and thoughts of a deaf character, while not being deaf himself. His facial expressions were top-notch, his body language amplified, and his gestures a lot more animated, which made it very easy to understand Heart, even when the sign language wasn't translated.
Fourth is a great actor as well - he nailed the gentleness of Li Ming, his determination to communicate with his friend, and his joy every time the other managed to talk.
I love that this series took a different route than most Thai series and decided to go with a darker, more realistic tone for the story. I also liked that the two couples balanced each other out, the main couple's relationship being a lot more convoluted and messy, and the secondary couple's being mostly smooth, innocent and pure.