Risky Romance is a Korean romance drama running 16 hour-long episodes (though I guess in Korea it ran as 32 half-hour long episodes to allow for more commercials -- apparently they don't do commercial breaks while an episode is running).

Joo In-ah (Lee Si-young) is a hospital doctor specializing in hormones. She is given the challenge of diagnosing surgeon Han Seung-joo (Ji Hyun-woo) who returned from a major accident a changed man -- angry and humorless. He comes to believe that In-ah is the former girlfriend of his best friend who, by dumping him harshly, indirectly caused his death in a drunken motorcycle accident.

That gives a reason for the two to spend time together. She is eternally cheerful which is trying because he is quite harsh and rude to her and eventually even gets her fired. In-ah starts a clinic from her home and Hyun-woo manages to acquire half the mortgage from In-ah's step-sister Joo Se-ra (Yoon Joo-hee), who just hates In-ah for being the favored of her parents and believing that In-ah inadvertently got their parents killed. Anyway Hyun-woo uses that half mortgage to justify moving into the big house in order to keep an eye on In-ah.

Eventually though Hyun-woo realizes he was wrong. Then has to keep the secret from In-ah because it was Se-ra who was the former girlfriend. Then in the last few epidodes Hyun-woo's headaches that he's had since the accident and that In-ah was trying to diagnose get worse as his feelings for In-ah grow into love...

It's kind of an up and down series and maybe not the best but thinking about it a bit I guess it's better than average. It executes the normal tropes but not as well as other series. Even the last scene showing everyone has a happy ending is a bit of a cheat since it goes from a dramatic "did he live?" fade to black then one year later and it elides the resolutions scenes to show the end scene.

Still I did enjoy the series but an another example of Prime Video not having the best Korean romantic drama series.