I dont want to spoil but if you want me to I can tell you what happens really
Pls spoil
She didn't really die tho she just kinda poisoned because Yvonne is already there its kinda complicated to explain but if you really want to know tho u should read the novel,
Well Yvonne and Derrick(unintended because his only crime is to bring Yvonne to Penny's coming of age ceremony) caused Penny to take the extreme measure by drinking the poison so the tiktok guy is wrong.
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One of the tiktok video, I've watched said he dropped this manhwa cuz she will ended up dead cuz of his brother/s doing(ಠ_ಠ)━☆ﾟ.*･｡ﾟ
Idk of it real¯_ಠ_ಠ_/¯