My dad's lieutenant seems to be a time traveler

In the early years of the Republic of China, the young marshal's boring second-generation ancestor's life was suddenly disrupted by his father's new adjutant.The new adjutant is handsome and capable, and seems to like to stare at the young commander at all times.The young marshal who thought that the adjutant was very conniving towards him, finally found out that the adjutant was very conniving towards him... Moreover, this adjutant actually came from time travel?The adjutant from time travel and the original local young commander began to have some unspeakable secrets.