Apart from a few episodes in between around the earthquake where the story feels a bit slow, the show as a whole was amazing and worth watching till the end.

Keeping this review simple, I'll list out some of the highlights of this show for me:
1. The firefighting was what attracted me to the show as there are not many shows that cover this line of work (The First Responders kdrama also do an excellent job). The show detailed all kinds of rescue work that firefighters are involved in and the kind of equipment and techniques used in their missions along with use of technology making it quite fascinating.
2. The romance plot is a bit of a slow burn but was also an interesting addition to the show. Highlighting the professional and personal lives of both the main leads and how they maintain a balance as well as how one impacts the other giving a well rounded idea of both characters.
3. The strict mother plot also gives another interesting perspective to Asian families and how even adults are forced to juggle between independence and not upsetting their parents with their personal decisions.
4. The portrayals by the actors were interesting and memorable. I also noticed that the female lead would change her mannerisms while at work, dealing with her mother and her boyfriend. While at work she was strong, reserved and unflinching. With her mother, she was quiet and timid. And later with her boyfriend, she was happy and almost child-like and carefree. I loved all these sides to her and the actress did a very realistic job with it. Similarly, the male lead was strict and stern at work, unwavering almost as the leader who is responsible for everyone's safety but with the female lead, he was protective, caring and playful in the latter half of the series. Even when they were trying to hide their affection for each other, they had moments where they let down their guards.
5. Each cast member also had some part to play in the story and made it quite a strong performance and an outstanding series. The sister, the firefighters and the medical staff added a bit of comedy and fun so it was not as serious as one might believe.

I don't have too many complaints.
1. Somewhere in between the show was a little slow so I wish that was cut shorter and other scenes that were cut out were added back instead.
2. No wedding scene. Though it's not a big issue but I would have liked to see that.
3. The second male lead (portrayed by Vin Zhang) had a very short role.
4. I wish we could have seen Da Peng and Dr. Li Nan's story move forward. That was disappointing.

The series also has lovely, soothing OST. I hope more viewers give this series a try. It's certainly worth your time.