Chen Yu, a young master from a wealthy family, was in trouble. In order to avoid being pursued by his enemies, he mistakenly assumed the identity of another person. As a weakling, he was forced to become the shadow guard of the current Jin Dynasty King Zhou Yanqi, codenamed Shadow Guard No. 7.
When the prince is in danger.
Other shadow guards: Protect the prince!
Shadow Guard No. 7: Your Majesty, please save me~
Zhou Yanqi: ... Who is whose shadow guard? !
Concept: The two male protagonists redeem each other sweetly every day, and eventually grow into the best version of themselves.