On January 19, Joy News 24 had an interview with the idol-actress following the successful completion of the JTBC drama 'Prison Playbook'.

In the recently ended drama, Krystal and actor Park Hae Soo were a couple. In reality, Park Hae Soo is 13 years older than the idol. A question asked if she felt overwhelmed by the big age gap, and she answered, "It was okay. Hae Soo oppa is such a good actor. So I just went on trusting him." She added, "Hae Soo oppa has a lot of aegyo and is very playful. If I remain silent to get into my character and mood, Hae Soo oppa later comes to me and teasingly says, 'I wanted to bother you so much."

In the drama, Krystal's character Ji Ho continues to care for Park Hae Soo's character Jae Hyuk even after they break up and their relationship continues. When asked about her thoughts on this uncertain relationship with "something" going on, Krystal strictly said, "(For me in reality) Breakup means the end." She explained, "I'm not the type that takes control of the partner in a relationship. But I really hate playing games - pushing and pulling. If you like it then you like it. If you don't then you don't."