The latest addition to the stellar cast of Doctors Korean drama could add a bit of mystery to the medical-themed love story.

Doctors Korean drama cast Han Bo Bae will play the half-sister of Yoo Hye-Jung (played by Park Shin Hye) named Yoo Yoo Na. The staff had high praises for the acting skills of the 22-year-old following her first day on the set. Hence, the show could likely draw in more fans given Han Bo Bae’s reputation as a good actress. The chemistry of Kim Rae Won as Hong Ji-hong and Park Shin Hye is the biggest draw of the K drama to date. It would be interesting to see how viewers will react to the new cast member.

According to Soompi, Yoo Yoo Nan is the only connection Park Shin Hye has with her family. Her character possesses a strong personality with notable leadership qualities. Yet she also brings a bit of mystery to the K drama given her secret past with her mother. The addition of the actress could put Doctors Korean drama further ahead of Descendants of the Sun.

TV ratings of Doctors Korean drama have remained high since it debuted last June 20. Hence, many believe it could rival the success of the recently concluded medical-themed K drama Descendants of the Sun. The premiere episode of Doctors earned 12.9% while the second day went up by 1.3% to 14.2%. TV ratings from episode 7 of the latest K drama averaged more than 20%, according to Viu TV. Thus, it beat competing TV shows aired on MBC and KBS. Descendants of the Sun achieved its highest rating of 38.8% during the season 1 finale episode last April. The wartime K drama plans to return in 2017 for a second season following its initial success.

Doctors Korean drama airs on SBS at 10:00 p.m. KST every Monday and Tuesday.