Both ML are members of royal family and finding their lover.
Both have complicated love relationship.

Both drama is about cheating partner. Although My Happy Ending is talking about a reality and Marry my husband is more fantastic. I feel they both have parallel story.

Both really romantic series without any drama. Both couple are loving and mischievous. The story is calm and flow naturally and smoothly. Really pleasing to watch both.

It is the same story, kinda like a remake.

Addicted Heroin is more rough, more savage, and you get the essence of the story but it goes fast as it is only 15 episodes of 20 minutes.

Stay With Me goes more in deep of the character and the story. Stay With Me is longer in time and in episodes. We can also see a it more of the story since it is lenghtier. And personnaly, I think it is more elegant less rough than Addicted Heroin.

Both involving Webtoon character coming to life. One is the romance with the author while the other is the author's daughter. They are both trying to get a happy ending.

Both male lead hates/fears human. And people are intruding in their home and change their values and habits. Although one is supernatural and the other is sci-fi, the vibe is similar.

Just kind of felt similar. When I was watching The Sound of Magic I was reminded of Goblin even though it is not similar but kinda is.

The vibe is similar. Both great general. Kinda the same story but at the same time different one. Both having a love conflict in their life. You might like.

Quite similar. They are both playing deadly game. They don't know what the game is before it start. They must win the game to survive.

Similar story. They are both about a team fighting to solve a past that was covered up. Both interesting in their own way, I couldn't help thinking about the other when I started watching.