Female lead was plotted by sister by drugging her. FL tries to escape and meet male lead in lift. She falls on ML and her drug starts to act . The ML who is clean freak sees her but don't push her. After their one night stand, FL wake up and remember her lost memory. When she sees ML she pays some money and leave. after that ML wakes up then investigate her. ML starts to pester her FL attend her sister marriage who was marrying her bf .she expose her sister extra affair in front of everyone and trys to leave her adoptive parents, but ML pester her ,she decided to marry him but on condition to never cheat her. Then later it is revealed that ML is a undercover officer and FL is a gun smuggler. They don't know one another indentity.