House Husband? Try Supreme Immortal (Dubbed)

Logan Bale, an immortal who has walked the earth for a thousand years, honors a dying promise to his disciple to protect the family for three years. To keep that vow, he marries his disciple's granddaughter, only to face her family's scorn and cruelty. He endures their contempt with quiet resolve, holding to one promise of his own: to walk away the moment the three years end.