I Crushed a Bug to Death, but the System Said I Killed a Dragon?

The system said "This world is too dangerous, host please be careful", Lin Chen was detained for three years. He awakened to the profession of useless individual, his parents were framed, and he was sent to a border city. After two years of searching for the truth to no avail, Lin Chen decided to die where he was. The system appears again and prompts: Warning! Warn! If an emperor-level ferocious beast is discovered, the host must escape as soon as possible! Lin Chen looked at the buzzing mosquitoes in front of him and forced him into a corner. Emperor level? A vicious beast? After Lin Chen was slapped to death, he actually gained ten times the blood-sucking and flying talents! Outside the city gate, Lin Chen, who had joined the security team, looked at the dying bird. The system continues to remind you like crazy! [Discover the emperor-level power! Please host surrender quickly! Surrender? I'm afraid there's something wrong with this system. Surrender yourself to a bird? Lin Chen used a catching technique to catch the dying bird! [The host... The host... Can actually subdue the emperor-level power! [System evaluation rewards are in progress...]