华裔女队长魏晓晨带领特警队，捣破人口贩卖集团基地，发现一具女性，竟然是孪生妹妹梁曦，晓晨悲痛欲绝，发誓要用余生追查妹妹被杀真相。
A brutal murder case causes twin sisters to be reunite again. Their life trajectories, which are like parallel lines, get intertwined. They exist in different realms when they meet again.
Due to investigation into an explosion case, Hong Kong police officer Yuen Sing-kit reaches Singapore. His girlfriend Leung Hei, an insurance claims investigator, is missing.
While cracking down on people smugglers, Singapore STAR Wei Xiao Chen discovers her younger sister Leung Hei’s dead body.
Wei Xiao Chen’s sister’s tragic death causes her to recall her childhood memories. To catch the perpetrator and find the truth, Wei Xiao Chen goes to Hong Kong. She disguises herself as Leung Hei and investigates people around Leung Hei. When the conundrum is about to be deciphered, she finds out Leung Hei’s death had implications for other crimes.
Wei Xiao Chen gets further from the truth as investigation progresses. The darkness behind the crimes is bottomless.
一對雙胞胎姐妹闊別多年，卻因妹妹梁曦離奇遇害，致令彼此平行線般的生活軌跡重新交織在一起。姐姐魏曉晨為了揪出真凶、查明真相，毅然頂替妹妹的身份，全盤接手妹妹的人際與生活，與謀害妹妹的黑暗勢力斡旋到底。
