Substitute Bride Assassin: Born Cold, Never Yielding

Xiwei is a female assassin from a Southeast Asian nation who formed a deep bond with Shen Shanshan, the daughter of the Shen family. However, Shen Shanshan's father's sudden death plunged her into crisis, forcing her to face the scheming marriage alliance of the Xiao family. To repay the life-saving grace, Xiwei voluntarily becomes Shen Shanshan's bodyguard, protecting her and helping her complete her revenge. Consequently, Xiwei and Shen Shanshan secretly swap identities, with Xiwei marrying into the Xiao family under Shen Shanshan's name to face unknown dangers. The self-interested younger uncle, Xiao Qinyuan, immediately suspects their true identities the moment they enter the house.