Watching that drama was like watching such great slow burn of intense passion between Lee Sangyeon and kim Haneul. The story was not to my taste but it was really awesome to watch them both on screen..... The scene where they were just talking on the phone, or even the silent moments they just looked at each other, was just sooo good. That drama was definitely-a-must-watch for that strong chemistry.
Anyway the nearest drama I can think of and can suggest you check out, would probably be the currently airing drama Just Between lovers. Lee Junho and Won JinAh has the same type of chemistry, and in addition the tone and feel of the story telling is somewhat similar. Slow, quiet, melancholic yet palpable
Another one is probably My Love eundong
.... But if you want a similar type of Emotional and physical soulmates restrained by circumstances plot with great chemistry between leads, maybe try checking out Princess Man, Autumn Concerto, My sunshine, and last but not the least Hundred Million stars in the sky.