The two are different in some points, but also similar in others and with a similar plot:
- Ml is from some kind of special forces (Shi JIn is from the army, Ke Lei is from SWAT)
- Fl is a doctor in both
- Both end up meeting again by chance in the future (in You are my hero, FL only finds out later that she already knew him)
- Both have earthquake scenarios, rescue scenes together.

It's the second season of It Started with a kiss, both have a cold male lead and a female lead that is in love with him for years, but it is not reciprocated, that she does everything to be able to reach him, in both she becomes a nurse because the male lead became a doctor, and the male lead does not like her at first but with time falls in love with her. The difference is that It started with a kiss and They kiss again is more complete, it shows them together since school, living together by chance, going to the same college, the male lead going from "I hate you" to "I love you", getting married, the difficulties after marriage mainly due to the personalities of both, them graduating and working together he as a doctor, she as a nurse. It is a very complete drama, enjoyable to watch, and the two have great chemistry together.

Both are unique characters, both have several similar second characters too, just like in Vincenzo, in Fiery Priest Father Kim ends up forming his own "team" over time, with the people close to him fighting by his side. In both dramas, at the beginning there is a lawyer/prosecutor protecting the villains, but who regrets it and switches to the protagonist's side over time.
If you like Lawyer Hong Cha Young, you will love Prosecutor Park Gyeong Sun, both are very similar, iconic and characters with unique and strong personalities.

In both dramas there are big and powerful people in the government being corrupt and committing crimes behind the scenes, and the protagonist decides to take revenge on them and destroy them one by one to avenge someone important to them.

In both dramas, the protagonists have a "secret identity" and secrets from the past.