聋人小马 （张艺兴 饰）和女儿木木（李珞桉 饰）彼此为伴，小孩姐木木是家里的“顶梁柱”，替爸爸和外界沟通，帮爸爸接活赚钱。然而随着木木的长大，她必须要融入听人的世界，两人形影不离的生活即将被打破。就在此时，一个专门利用聋人犯罪的团伙盯上了小马，爱女心切的他一步步被骗入了犯罪的深渊.....

Deaf Xiao Ma and his daughter Mumu rely on each other for companionship. The little "big sister" Mumu serves as the family's pillar—bridging communication between her father and the outside world, helping him secure work and earn a living. However, as Mumu grows older, she must integrate into the hearing world, and their inseparable life is about to be disrupted. Just then, a criminal syndicate that specifically preys on the deaf sets its sights on Xiao Ma. Desperate to protect his daughter, he is gradually lured step by step into the abyss of crime...

该剧改编自猫腻同名畅销小说，承接上季，范闲（张若昀 饰）率领使团回归途中，二皇子以费介、范思辙以及滕家遗孤的安危来威胁范闲，逼他向自己俯首称臣，二人的矛盾就此激发。范闲所面对的抱月楼迷局，以及接踵而至的春闱危机，都是二皇子精心给范闲布下的陷阱。
范闲与林婉儿如愿大婚，紧接着，范闲接手内库，却发现内库负债累累。 范闲拒绝了庆余堂大掌柜的相助，决定靠自己的力量解决内库危机，范闲相约城中众商贾相聚苍山，以售卖“库债”为机筹集了两千多万银两，解决了内库空虚问题。
悬空寺上，庆帝遭遇三连刺杀，范闲出手相救却导致武功全废。危机四伏，压力陡增，范闲别无选择，他必须以这样的身体下江南，挑战庞大的势力与既定的游戏规则，以求彻底夺回内库。