When We Were Young (青春最好时) is the remake of Korean drama, Who Are You: School 2015 which starred Kim So Hyun, Nam Joo Hyuk and Yook Sung Jae. That drama didn’t end well for me because the love lines started to blur and the one she should love, she doesn’t love! GAHHH. My heart. The Chinese remake cast Zhang Xue Ying, Joseph Zeng Shun Xi, and Wang Bo Wen.