Both involves the main character as an undercover cop infiltrating a crime syndicate. Difficult situation of preventing identity from getting exposed.

Both involve a psychopath serial killer. Cops that are extremely frustrating and incompetent at their job that it becomes almost laughable.

Disaster movies starring Lee Byung Hun. One is about airplane terrorism while the other is about a volcanic eruption.

Kang Ha Neul and Jung So Min reunion. Both also played love interests.
Both are romantic comedy movies.

Both are romantic comedy dramas taking place in hotel setting.
Both have similar fonts in poster.
One has fantasy elements while the other doesn't.

Heist/Smuggling films involving action and crime. Featuring ensemble casts and both stars Kim Hye Soo.

One takes place in the 70s, the other takes place in the 80s. Both are coming-of-age dramas about pursuing dreams and ambitions, with economic reform as backdrop. Both have Li Qin as the FL.

Both are occult dramas and involve mysterious supernatural beings entering into the mortal world. Occult, mystery, and supernatural.

Tony Leung and Andy Lau reunion. The Goldfinger is directed Felix Chong, who was the screenwriter for Infernal Affairs. Both are also crime mystery films.

Arthouse films made by two of the most acclaimed Korean directors, Park Chan Wook and Lee Chang Dong. Both films stun viewers with their ambiguity, subtle elements, and unresolved mysteries.

Firefighter movies. Racing against time to save survivors. Intense and emotional. One is a nuclear power plant, the other is an office building.

Directed by the same director, Dante Lam. Both are based on real-life events of chinese operatives rescuing chinese nationals in danger overseas. One taking place in Thailand and one in Yemen.