Xiaosi said: Youth is a bright sadness.
It is precisely because of his brightness that it hurts so much.
When he faces the separation of his girlfriend, will he get lost or get out of the hurt city?
When she faces the man she has secretly loved for many years, but is her best friend's boyfriend, how will she choose?
When he gradually falls in love with another girl, the cruel reality that his ex-girlfriend is crazy is placed in front of him. How will he face it?
Is her unscrupulous pursuit of love causing harm or happiness?
…………
Lost City will solve the mysteries for you one by one!