一名失恋作家站上天台准备轻生。路过的天字2号决定出手，用一场真假难辨的“苦情戏”，让他重新看见活下去的理由。

三个曾经受伤、被骗，却依然相信正义的普通人，被神秘组织选中成为「最爱 Angels」——天字9号、7号与2号。他们各有所长，以格斗、易容、心理战执行秘密任务。从各自为战到并肩作战，三位天使在一次次危机中建立信任，也逐渐揭开天使组织背后的秘密。

Three ordinary people, each scarred by betrayal yet still believing in justice, are recruited into a mysterious organisation as Angels 9, 7 and 2. Armed with unique skills in combat, disguise and psychological tactics, they take on secret missions while learning to trust one another—and uncovering the mystery behind the Angels organisation itself.