Watch Online Free on Watchseries. Lin Yu'an receives a letter from the past, sent by Chen Yabai, who sacrificed himself to protect her. The two begin a dialogue across time, with Lin Yu'an attempting to guide Chen Yabai away from her and change his fate. However, when disaster strikes, Chen Yabai sacrifices himself once more. As fate turns, Lin Yu'an finally understands the deep love hidden within the young man.