Both dramas are about go.
Alhtough there is no romance in Hikaru no Go, the story is very interesting.

Yoo Jae Suk and Lee Kwang Soo are members of both variety show. The concepts are very different since Running Man focus on humor while Busted focus on mystery.

Haha and Kim Jong Kook are Running Man members. Although the setting is very different, the humor remains the same.

Unknown Number is the chinese adaptation of the korean drama Signal. I wonder why noone subbed it yet.

In Sampat Ruttikan, she can see the death of every person she touches.
In The Game: Towards Zero, he can see the death of every person looking inot his eyes.

If like me, you never found this season 2 of Psychometrer Eiji, you can try He is Psychometric. Although the story isn't the same, it's also a police drama with a psychometrer ML .

Both are police dramas with a psychometrer ML .
Psychometrer Eiji is now old so it might be difficult to find the drama but I strongly recommand the manga.

Kimi wa Petto is about a woman letting a man live in her apartment on the condition that he behaves like a dog at home.
My Woofy Poofy Love is about a woman co-habiting with a man who can actually transform into a dog.

Kimi wa Petto is about a woman letting a man live in her apartment on the condition that he behaves like a dog at home.
My Woofy Poofy Love is about a woman co-habiting with a man who can actually transform into a dog.

Bridal Mask and Chicago Typewriter are both set during the japanese occupation.

Both dramas are light romcoms with action, involving an actor's bodyguard hiding his/her secret identity.

Both dramas are romances about the two main characters swapping bodies.