Chun Jung Myung saw that his grandfather was opposing his relationship and decided to separate from Choi Kang Hee.
On the episode of tvN Friday/Saturday drama "Heart to Heart" (script Lee Jung Ah, Ko Sun Hee, director Lee Yoon Jung) broadcast on Feb. 28th, Ko Yi Suk (played by Chun Jung Myung) broke up with Cha Hong Do (played by Choi Kang Hee).
Lee Suk went to his grandfather Ko Sang Kyu (played by Joo Hyun) and asked for forgiveness. Nonetheless, Sang Kyu was absolutely firm. With that, Sang Kyu started to get upset at Lee Suk and in the process, he collapsed.
Lee Suk then heard that his grandfather had heart problems and therefore should not engage in any pressuring situations. With that, Lee Suk asked Hong Do for forgiveness. Afterwards, Lee Suk contemplated for a while and called Hong Do.
He said, "My grandfather collapsed. I think we're going to have to really break up." With that, he broke up with her.
Lee Suk could not easily take in the separation with Hong Do and Hong Do was the same. As they started to bawl, they both missed each other.
Meanwhile, tvN drama "Heart to Heart" is about Cha Hong Do who suffers from severe blushing and her psychiatrist Ko Yi Suk.