"Reply 1988" is a series of dramas that is set in a certain periodical era. As it reflects a certain year in Korean history, the past reply series has been set in 1998 and 1994 as the actors gained a lot of popularity bringing up the trends of the past and all relevant musical and artistic culture.

In "Reply 1988" Park Bo Gum showed off her great skils playing with a cube.

The storyline is that it's set in 1988 at a neighborhood in Seoul where five families live on the same alley road. It is a comical family story.

On the 4th episode of tvN Friday/Saturday drama "Reply 1988" Duk Sun (played by Hye Ri) was playing with baduk pieces where Taek (played by Park Bo Gum) took some time and played with a Rubik's cube.

The reason that Taek was teaching Duk Sun baduk was because he wanted to improve her sense of focus. Duk Sun declared on this day to his parents, "I will go to college." Nonetheless, he was ignored by his parents. At this, he decided that he was going to first improve his sense of focus.

Duk Sun first mixed the cube with the one that was at Taek's house. He was able to crack it at once, which surprised Duk Sun.