Clara guest starred on the latest episode of MBC's 'Radio Star' along with Sayuri, Kim Heung Guk and Lee Joon where the stars entertained the viewers with their unique personalities. 

During the show, Clara gained attention for mentioning her troubles with a past boyfriend who was a top star. 

SEE ALSO: Clara regrets her decision in not accepting SM Entertainment's proposal to join Girls' Generation

She shared, "My past boyfriend knew what I was doing even when I didn't tell him. He didn't accept it when I tried to break up with him. I started to hide myself and avoided him." 

Her boyfriend's surprising behaviors didn't stop there. Clara revealed, "After I was done with my work, I got in my stylist's car and told my manager to act like I was riding with him. I told him to never stop at a red light because he will catch up and see that I wasn't inside." 

She shocked the viewers by adding, "When I tried to break up with him, he tried to cut himself on the wrist. He was a top star then and still is. I ran into him once at the broadcasting station and he acted like nothing was wrong. He hasn't gotten married yet and he's doing well with his girlfriend." 

After hearing about Clara's boyfriend, the viewers commented with, "Clara's past boyfriend is scary. I wonder if he's doing that to his current girlfriend?" and "Who is this supposed top star?"

Meanwhile,  the show had other surprising and comical moments. Sayuri sharing that she was stressed about appearing on the show with Clara, who is known for her glamorous figure, and surprised the MCs by reaching into her shirt to pull out a wad of toilet paper that she had stuffed her bra with.