Shen's tsun-tsun makes so much sense when she grew up with a narcissist that she's somehow still attracted to. And to be fair to her, Jiang is a lovable narcissist. She's still very human and their interactions are pretty cute.
I don't think that she's a narcissist, so much as she doesn't understand the emotional component of ... just about anything related to other people.
Ohhh yeah, maybe narcissist is a bit too strong and it's more like she has some narcissistic tendencies but nothing too bad. I'd say she's self-assured but dialed up a bit much at times. Also works with what the others mentioned too.
All in all, I actually think she's mostly fine as she is and what's more likely to change is Shen's perception.
The assistant feeling the ache from the lovesickness emanating from Jiang is too cute. I'd say she has a good career ahead of her as the future CEO of Yuri.