This is episode 45 of 61 of Back From the Abyss. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
The true heir, buried alive by an impostor, is possessed by a vengeful spirit determined to seek justice for him. At the Lu family banquet, he exposes the truth—revealing their coldness and the impostor’s schemes—and ultimately brings the impostor to justice, making them regret their actions.