To prevent an investigation into a fraudulent bidding case, Woorim Engineering & Construction drives accounting manager Park Sun-dal to commit suicide under the condition that 30 million won be given to the bereaved families. Seong-Hoon (Shin Seong-Il), an employee at Woorim Construction who went to Busan to confirm Manager Park's suicide, meets a woman named Ji-Won (Eom Aing-Ran) on his way to Seoul. When Seong-hoon finds out that Ji-won is the mistress of Hong Man-seok (Jang Dong-hwi), the president of Woorim Engineering & Construction, who is also his benefactor, he tries to give up the relationship, but the more he tries, the deeper the relationship between them becomes. Knowing this, President Hong tries to separate the two, but eventually gives up due to their love that transcends death.