I have mixed feelings regarding this series and Taiwan BL in general. I remember when HISTory aired, the very first series was called "Obessed", and everyone was talking about it. I checked it out and thought the story makes zero sense, but the actors were committed and showed us great make-out scenes. Many years later, not much changed.
This series' author also wrote Trapped and MODC, and again, I have the same criticism. There is only one explanation for the author's success I can come up with (some even call her the "queen of Taiwan BL"): She puts so much stuff into her stories, that there is something for everyone. You like a couple where one guy is much older? Check. You like a couple with unexpected top/bottom roles? Check. You're into student-teacher stories? Check. You like the tsundere type and the cold/stoic type? Check. You like big height differences? Check. You like the one being manly, and the other being cute? Check. You like mafia guys? Check. So I assume whoever reads this found at least two points they like. So go watch it!
Seriously, the author talks about stuff she doesn't know anything about. In Trapped those police officers behaved like children playing detective, now in Kiseki the mafia guys behave like children running a car repair shop and doing some street fights. The older mafia guys are sitting in the hot tub, looking dangerous and talking in a way that it sounds important. It's low budget, I know, but don't go there, if you're not capable of making it believable. The whole plot is a mess. Two young guys going to prison for 4 years is a good example of the weak wattpad-style storytelling. You could write a whole series about their experience in jail, but they brush over it, and they even get out in the same episode. Not much changed, as if they had seen each other just months ago.
Back to the same criticism I had regarding Trapped and MODC: There is no balance regarding the mood of the story. Kisekei had some very touching and serious moments, but then it gets incredible cheesy and corny. It's funny, and in the next moment it's tragic. The author apparently wants to evoke as many emotions in the viewer as possible. The result? It's a mess.
But not only the plot is a mess, the acting is too. Ai Di (Louis Chiang) is the only good actor, I would even say, he is the only "real" actor. What do I mean by that? He embodies the character wholeheartedly. Even if the character develops or changes over time, you still feel it's the same character. I have no issue with Chen Yi (Nat Chen) acting. He is doing a good job, and it's not uncommon that an actor reaches a new level when paired with someone talented. But still, it's obvious he isn't as good as Louis. Unfortunately, everyone else, from the younger guys to the older guys, is just here for the paycheck.
My final thoughts and rating? I love the 2nd couple, they are my guilty pleasure for many reasons. I hope those two get a new series, because I love their chemistry and acting. Everything else was forgettable. The main couple was too cheesy, and Taro Lin should really work on his acting. For me this was second hand embarrassment.
7 stars for the effort (they did some things right, and some scenes were beautifully filmed), but since I'm madly in love with Ai Di and Chen Yi I will give 8 stars.