The preview for the 9th episode of the tvN drama Jeongnyeon: The Star is Born has been released, featuring a shocking scene where Kang So Bok (played by Ra Mi Ran) slaps Yoon Jeong Nyeon (played by Kim Tae Ri). Released on Sunday, the preview shows Jeong Nyeon, who has been pushing herself to the brink to perfect her vocal skills for a major performance with a national opera troupe. Her intense practice takes a severe toll on her health, leading to the devastating diagnosis that she must give up singing. This news throws Jeong Nyeon into a whirlwind of confusion and despair. After her doctor a…