According to the drama's reps, main leads Sung Hoon and Choi Yoon Young will play star-crossed lovers. Sung Hoon will play the role of Kang Moo Yeol who seems to have it all on the outside but grows up with family issues and pain from the loss of his former love Han Yoo Rim (played by Girls' Generation's Seohyun). Choi Yoon Young will play the role of Han Yoo Rim's sister, Han Yoo Jung, who loses her family but doesn't let that stop her from moving forward in her life. She ends up getting involved with Kang Moo Yeol 10 years later.
Lee Won Geun will play the younger version of Kang Moo Yeol who meets his first love Han Yoo Rim in high school. The younger version of Han Yoo Jung will be played by Lee Hye In.
'Passionate Love' will premiere on September 28!