Concerto for Dark Knight

An eternal search against the cycle life, for a promise made 500 years ago that will not be forgotten. What will happen when a common girl meets a vampire prince? How will the innocent girl choose between her childhood friend and the blood-sucking prince? 500 years ago, a vampire prince fell in love with a human girl. The mortal girl died while the immortal vampire lived on. The heartbroken vampire finally found a way to become human. So our story takes place in modern times, where an ordinary girl is living an ordinary day until the aforementioned vampire disrupts her otherwise peaceful life. (Source: Manhuatai, translated)