Oshi no Ko is a dark, multi-genre anime series that focuses on the deceptively brutal and stressful world of musical idols, first explored through the eyes of Ai Hoshino. Ai was introduced as a conflicted musical idol, a teenage girl who had never known love but had to project a loving image to her countless fans. Then she became a mother, which only deepened her insecurities.
Source:https://www.cbr.com/oshi-no-ko-hoshino-family-eye-stars-hidden-meaning/