My Imperial Guard Boyfriend

An imperial guard got a time travel and arrived in a little girl' home. lonely and desperate for love, she treated him as her boyfriend. but he kept in mind his unfinished task in his world and eagered to go back. he promised to come back to be with her but failed. Will they meet again? This time, let me travel through time and love you in your world... (Source: Mangatoon) *Includes 8 side-stories*