黑帮大佬和我的365Attention seeker YouTuber Jang Ha-Da is trying to get popular again. One day, legendary singer Yoon Si-Nae disappears. So, Jang Ha-Da uses her mother, an imitation singer Yoon Si-Nae, as a live broadcasting material and gets enthusiastic responses from subscribers. Meanwhile, Yoon Si-Nae, who is despairing after losing the dream stage, decides to leave in search of Yoon Si-Nae with fellow imitation singer Un Si-Nae. And Jang Ha-Da secretly set up a live broadcast.