All My Brothers Are Top-Notch

It was a sunny day and Mrs. Liu gave birth to her seventh son. However, Father Liu looked grave. He summoned his eldest son and gave his stupid third brother a wooden hairpin. "Xi'er, you have been the most sensible since you were a child, and you are also safe in doing things. My father has entrusted Feng'er to you. Remember, you must protect him in the future... Forget it, take your third brother with you now and leave immediately." Liu Xi has protected his third brother well for fifteen years, but the Luozhou Liu family no longer exists...