After retiring, world-class assassin Samson struggles to find a job. A chance encounter with Ruby, beautiful president of the Shen Group, lands him a role as her personal bodyguard. Ruby, targeted for possessing the Loong Chip technology, faces constant assassination attempts. Samson foils each attack, and as they spend time together, love blossoms. In the end, the killer wins the lady's heart.
Breaking news announces Dante's sudden passing. Ruby orders her press conference to proceed as planned, strictly keeping the Loong Chip info hidden. Top assassin Hayd rejects his organization's plea to return, opting for a normal life but facing job-hunt hurdles.
Ruby, the stunning CEO of Shen Group and Cloud City's top beauty, is targeted by thugs plotting to drug her for Mr. James. Just as the thugs get aggressive, her top assassin bodyguard steps in, intimidating them into fleeing and ensuring her safety with tense, thrilling action.
After an intimate encounter, Shen Group's Ms. Ruby tries to pay legendary assassin Samson to stay quiet. As Ruby prepares the highly anticipated Loong Chip launch to shock the world, Samson gets a security job offer from Shen Group and surprisingly accepts it despite initial disdain.
New bodyguard Samson starts working for Ruby, leaving her colleagues confused about his high monthly pay despite his ordinary appearance. When Ruby is about to attend her Loong Chip press conference, James suddenly appears and threatens to cancel the event, building up tense suspense.
Young Master Tang tries to seize the Loong Chip—Ruby's father's lifelong work—and force her to submit. Fearing Tang's ex-mercenary bodyguards, most security guards back off, but guard Samson bravely steps up, sparking a tense high-stakes confrontation.
Ruby hurries to attend a conference, ordering her bodyguard Samson to stall James and his men. Samson accepts confidently despite warnings. James flies into a fury and orders Samson killed, only to be shocked to find Samson in his car as he tries to leave.
CEO Ruby announces her father's Loong Chip, over 20 years ahead of global tech, will be open-sourced. James's sabotage is foiled by skilled guard Samson, prompting his father to hire top-ranked Dark Night Assassins to target Ruby.
After escaping an attack unharmed, Ms. Ruby grants her bodyguard a $50,000 bonus. When the bodyguard seeks help finding accommodation, a top-ranked disguised assassin Mae (codenamed Dark Night) infiltrates, targeting Ruby and sparking intense suspense.
Ranked #1 international assassin Hayd warns off Dark Night's team, sparing their subordinate after trespassing forbidden territory. He quickly spots an imposter of Ruby. Frustrated villains rehire top-ten sniper George, a flawless marksman, putting Ruby in deadly hidden peril.
Determined to attend the tech gala with the Loong Chip release, Ruby ignores warnings and recruits off-duty card-playing Samson as her bodyguard with triple pay. En route, they encounter a sniper with a wall-piercing rifle, and Samson prepares to fight back using just a playing card.
Arrogant assassin George boasts of his undefeated fighting record, only to face his old rival Hayd, who believed George died three years ago. George begs for mercy and offers to expose his employer, but Hayd insists on resolving the matter on his own.
After surviving a sniper attack that leaves her legs weak, Ms. Ruby firmly refuses to sell her father's Loong Chip technology despite risks. Her bodyguard teases her fear yet offers help, and a playful exchange sparks confusion about their bond as they head to the gala.
Ruby reflects on Samson repeatedly saving her life—including from a sniper—and questions his true identity, as his skills far outmatch a regular security guard. Meanwhile, villains reeling from George's death dig up Samson's basic background and hatch a new scheme to target Ruby at the upcoming tech gala.
James initiates a tense encounter with Ruby, who first tells him to get lost. He threatens to use the Tang family's influence to sabotage her cocktail party goals, then unexpectedly offers to introduce her to Ethan, the top raw material supplier crucial for her Loong Chip's upcoming mass production.
James introduces Ruby, creator of the soon-to-mass-produce Loong Chip, to Ethan, the leading chip raw material supplier. Out of respect for James, Ethan agrees to a private talk, sparking anticipation for their high-stakes supply cooperation with a hint of secrecy.
Supplier Ethan sparks a clash by demanding no secretary be present during business talks, boasting his in-demand raw materials give him the upper hand. The opposing side faces a tough dilemma: complying means trusting a James-introduced stranger, while refusing risks costly, riskier alternative material sourcing.
Under pressure, Ruby consents to discussing the partnership with Ethan after being warned of his anger. Later, James orders a secretary to wait in the side lounge, and someone summons another person, hinting at tense hidden dynamics in the upcoming business talks.
Someone grows suspicious of Samson after he gets Ruby and her secretary out of the way. Later, James offers Samson five million dollars to betray his long-time employer Ruby and steal the valuable Loong Chip technology, setting up a tense moral dilemma.
James attempts to bribe bodyguard Samson with five million dollars, arguing lifelong guard work can never earn such a sum. Convinced Samson has accepted, he orders wine to celebrate, believing he’s cleared the way to steal Ruby’s chip tech for the Tang Group. But Samson’s retort hints James may have miscalculated—will his scheme backfire?
Samson sees through James' trick at the party, accepts his bribe but refuses to betray Ruby. He warns James not to target Ruby's chip with harsh threats. Unbeknownst to Samson, James is stalling—Ethan has drugged Ruby and is taking her to the river to seize the chip by drowning her.