We Are In Love [C] - Celebrities "date" each other, 3 seasons total. It's a remake of the korean We Got Married but shorter.
If You are the One [C] - Dating game show
Love Timing [C]
Hi Housemate [C] - I don't actually know what this is about or if it's subbed but it seems like something you might like?
The Inn [C]
Xin Fu San Chong Zou / 幸福三重奏 [C] - it's not on MDL but this is a reality about 3 married celeb couples
Who's The Murderer S1-4 [C] remake of Crime Scene [K]- Game show where celebs roleplay and have to solve a murder
Back to Field S1-2 [C] - A chill, peaceful variety where the hosts live in the countryside and host celeb guests each episode and they cook from scratch/chat/hang with each other.
I recommend searching TV shows with the "Variety Show" tag, there are literally so many, it depends on your taste.
Some psychological/suspense/thriller dramas: Liar Game, Kurosagi, The Quiz Show 1 & 2, White Christmas, Bloody Monday, Children of Nobody, Tomodachi Game, Unnatural, N no Tame Ni, Love Shuffle, Limit, BORDER, Hanzawa Naoki, Special Affairs Team TEN, Karamazov no Kyodai