[This story has a tragic ending.]
In public, Helan Ying is a timid, shy, soft-spoken princess. In private, he is a cold-blooded assassin who draws his sword and kills without blinking.
The Prince of Qi intends to usurp the throne, but the current emperor has the loyal and capable Prince of Qin, Sheng Yangxian, by his side. He is the biggest obstacle in the Prince of Qi's bid for power.
The Prince of Qin commands immense influence, and Sheng Yangxian is ruthless and deeply calculating. At court, he is known as the King of Hell.
To eliminate the Prince of Qin, the Prince of Qi handpicks an assassin to infiltrate his estate and wait for the right moment to strike.
That assassin is Helan Ying. He grew up in an organization that trains assassins, and has never failed to complete a mission.
But even this cold-blooded, heartless assassin falls at the hands of the man known as the King of Hell.
In all his years as an assassin, no one had ever taught him what love was, let alone that he didn't have to grit his teeth and endure the pain when he was hurt.
Helan Ying falls in love, but Sheng Yangxian turns against him.
His identity as an assassin is discovered on the eve of their wedding, and Helan Ying loses the warmth he had found.
Sheng Yangxian: "I remember the princess fears pain more than anything. So what are we to do? From now on, you'll spend every day in pain."