In order to make his ill mother happy, Levi asked Erwin to come to the Ackerman family gathering and pretend to be his boyfriend for the holidays. But would his family believe his lies? Would he be able to keep the act in front of the Yeager brothers who Mikasa invited into the gathering, too? Why did this Zeke person keep on flirting with Erwin? And why did that make Levi angry?