Recommendations

Same cast, different story.
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part 2 of train to busan. similar thrill w zombies being the difference. survival and escape is the motive

similarities:
- apocalypse, escape
- tear-jerker
- thriller
- gore
- 2 parts
differences:
- movie, zombies

Someone recommended Kingdom and season 2 is must watch too. Both series are about people fighting to survive in the world full of creatures that want to kill them.

Similarities:
- similar thrill and suspense
- good vs evil subplot
Differences in Kingdom:
- low on humor
- zombies
- period-based
Pros of Kingdom:
- more episodes
- satiates your hunger for apocalypse shows after DAS, trust me

Both dramas revolve around close childhood friendships, there are parallel in terms of retro village type warm neighborhood setting and one sided feelings , depicted in a pure innocent way.

In DAS there are evil aliens and in Hellbound some monsters from hell and people struggling to fight them.

Similar stories:
- childhood friends
- science students
- university romance
- adorable cast with good chemistry

- Short and easily binged
- Suspense and Thrill
- Atmosphere
- Character Development
- Emotional
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Both movies are about failed couple relationships and second chances in love.
Both movies are about ex-cons that try to start a new life.
Both movies are about handling jealousy and outburst of rage.

Both story deal with two too-close friends and their own love story.
Their Personal Professional life and wedding.

Both have a robot as a lead.

A story of popular idol Hu Li, who discovers his true identity as an AI and his company is planning to destroyed him in the form of "suicide by depression" due to an irreparable malfunction. Hu Li then escapes to Ji Nian's house, and begins a fantastical and romantic life of living together.

Also has a robot theme.
As the chairman of a successful technology company, Lu Sen often finds himself in large group settings. While he has no problem addressing any number of people, he has incredible difficulty with any sort of direct, physical contact. Suffering from a strange allergy which is only triggered by direct skin-to-skin contact, something as simple as a handshake could prove deadly. Without the ability to directly come into contact with others, Lu Sen is intrigued when he learns a doctor by the name of Fu Yang has created an incredibly lifelike robot companion dubbed “Friday”. Willing to invest further in Dr. Fu Yang’s work, Lu Sen has requested Friday be delivered to his home so he can test out the full capabilities of this incredible creation. Though agreeing to Lu Sen’s request, the doctor is mortified when a last-minute technical issue renders his robot useless. Unable to bear the thought of losing both his credibility and his funding, he asks his former assistant, Yang Shan Shan, to take the robot’s place, just long enough for him to get it up and to run again. Being the real-life model for the robot’s looks, Shan Shan is identical to the robot in every way and only agrees to the doctor’s request when she realizes she really has no other choice. Arriving at Lu Sen’s home on “Friday”, Shan Shan does her best to emulate the robot’s behavior...

A teen in both is being raised by a killer/group of killers. It affects their relationship. In Kill Bok Soon a teen doesn't know about them being a killer, In Hwayi: A monster Boy a teen knows and is being raised to be a killer too.

Happiness isn't about high school students but adults however these two dramas are similar. In both normal people are put in the grave situation one day and have to fight for their lifes.