I get what you're saying, she was obviously wrong in that situation
But we should also consider that she was bipolar (untreated at that) and she was also delusional and on top of that she had anger management issues because of her family trauma, she was dysphoric about her appearance as well.
I'm not saying that gives you the right to treat your one and only friend badly
But
She was problematic and scared and lost and uneducated about her own mental state, her mother had zero empathy towards her and her best friend was cheering her toxic behaviour by continuing to write those letters
At that moment after she had her heart broken by WooYeon, when she found out her only safe person thinks poorly of her, I think it was the last string of her sanity
She just snapped and poured it all out
All the anger she was bottling up her whole life
At last
I think she's type 1 bipolar
I'm type 2 so I don't fully understand her, because I almost never experience those mania episodes but I think I get the gist of it. We all saw her at her worst, but I must say the character was so beautifully written
Is it just me? But I don't really like Jennie that much, I mean it's nice she saved In-seob from that Fred guy but she was also a mean bitch, she's depressed yeah sure but that doesn't mean she has the rights to invalidate other people's feelings, she only thinks about herself and thinks she's the only one suffering