Lin Wanxing, a top graduate, joined the mysterious multinational giant Ye Jin Group with his extraordinary strength and became the secretary to the president Lu Jin. This rumored CEO who never shows up and only works at night not only acts mysteriously, but also hides an unknown secret - he is the ancestor of a vampire who has lived for thousands of years.
After joining the company, Lin Wanxing, while dealing with factional strife and rejection from colleagues in the workplace, encountered Lu Jin's anomalies one after another: he hated the sun, was afraid of garlic, and his wounds could heal instantly. Lu Jin was attracted by her tenacity and she broke the principle of "not having close contact with humans" and secretly resolved crises for her many times. In a fatal accident, Lu Jin exposed his super speed and super strength to save her, and doubts about his vampire identity spread in Lin Wanxing's heart.
From the fetters in the workplace to the bloody temptation, from the crisis of trust after the identity is exposed to the life and death binding of the blood contract, the two people's love gradually grows and their bond deepens amidst the multiple crises of species estrangement, obstruction from the same race, and hunter pursuit. When the revenge conspiracy of the ancient vampire organization Dark Blood Alliance surfaced, when the dark power of the ancestor's bloodline was on the verge of losing control, and when the struggle for the Moonlight Crystal caused turmoil between the two worlds, Lin Wanxing not only discovered that his encounter with Lu Jin had a fateful origin, but also awakened to the mission of guarding the balance between the two worlds.
Love that spans species, the power game in the workplace, the entanglement of thousand-year fate, and the protection of peace between the two worlds, Lin Wanxing has grown from an ignorant newbie in the workplace to a guardian who can fight side by side with Lu Jin, and Lu Jin also finds the true meaning of eternal life in love after being frozen for thousands of years. This taboo encounter began in the twilight workplace
