Su Yu, an ordinary young man, was involved in the undercurrent of the spy world due to an accident. Under the training of the mysterious organization, he quickly grew up from an ignorant novice. With his extraordinary wisdom and tenacious will, he emerged in the bloody espionage battlefield. During the mission, he went deep into the enemy camp, shuttled through the hail of bullets, battled wits and courage with all forces, and wandered on the edge of life and death again and again. At the same time, he is also caught in a complex emotional entanglement. On one side, he is a confidante who fights side by side and depends on each other for life and death. On the other side, he has the responsibility of his family and country that he cannot give up. Can Su Yu keep the justice in his heart and write his own legend in this dangerous spy career?
