10 Days to the End.

Summary

Qi Xia confronts Officer Li about his willingness to sacrifice himself for strangers, questioning the practicality of his "Echo" ability. Officer Li, a detective, insists on protecting victims regardless of their familiarity. As they discuss the risks of their situation, Qi Xia offers to help Officer Li deal with a dangerous figure from his past, Zhang Hua Nan, once he returns to his time. They establish a secret phrase to trigger Qi Xia's memory if he forgets. Qi Xia also reveals his intent to reclaim something from the 'Land of Endings' and shares a mysterious contract he found, which leaves Officer Li bewildered by its bizarre content.

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