The king returns, just to protect you, the only one in the world. Male Protagonist (Lin Feng): He was once the invincible god of war "Yam Luo" in the mercenary world/underground world. He may have retired because he was tired of killing or was seriously injured due to betrayal. In fact, he has great medical skills and unfathomable strength. He looks cold on the outside, but affectionate on the inside, and is extremely gentle to his daughter.
· Female Protagonist (Su Wan): The male protagonist's lover/wife many years ago. She has a soft personality but is strong on the inside. She gave birth to and raised a daughter alone. Her life is difficult and she may be seriously ill or face a huge crisis.
· Cute baby (Lin Xiaoxiao): About 4-5 years old, smart, quirky, and the hero's little cotton-padded jacket and Nilin. He may also have inherited some of his father's talents (such as intuition about medical skills, special bravery, etc.).
· Villain: a local wealthy family (forcing the heroine to marry), a former enemy (discovering the traces of the hero), or someone who betrayed the hero in the past
