Alternatively, perhaps the user is referring to a real person's social media content, where "Live1213" is part of their handle, and they want an analysis of their relationships and romantic storylines presented in their content.

But since the user is asking for a deep feature, I'll proceed with the fictional character route, making up plausible elements for the analysis.

Alternatively, if it's a real person, perhaps the user is mistaken in the name. For example, "Khushi Mukherjee" might be a typo for "Khushi Kapoor" or another name. However, since I can't confirm that, I need to make an educated guess.

Let me check. Quick search: "Khushi Mukherjee" and "Live1213". Oh, maybe "Khushi Mukherjee" is a content creator on Live1213, a live-streaming platform? Or perhaps "Live1213" is a fan site or community. Alternatively, maybe it's a typo for "Live123" which is a live streaming service, but that's a stretch.

Since I can't confirm the reference, maybe I should proceed as if "Khushi Mukherjee" is a fictional character from a web series called "Live1213". Alternatively, maybe "Live1213" is a typo, and the user meant "Love, Life, and Longing" or something similar. Alternatively, maybe "Live1213" is a hashtag, and the user wants a deep feature on the relationships of a particular influencer or personality who uses that hashtag.

Given the uncertainty, perhaps the best path is to outline a hypothetical deep feature based on the assumption that "Khushi Mukherjee" is a fictional character from a web series titled "Live1213", with the key elements focusing on their romantic relationships and how these shape their story. Alternatively, if it's a real person, to address the lack of available information.