Who Killed Sara?: Season 2

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Who Killed Sara?" Season 2.
Constraints:
Use ONLY provided synopsis and sources.
No invented titles, names, dates, counts, awards, ratings, etc.
If a detail is not in the material, omit it.
Write original, neutral, encyclopedic prose.
No markdown, no asterisks, no headings, no bullet points in the prose.
Output valid JSON only.
JSON Keys:
overview: 160-220 word summary of the season's narrative arc.
primer: Array of exactly 4 concise bullet points summarizing essential previous lore, character positions, and stakes.
Source [1]: "To exact his revenge, Álex will have to bring to light his sister's darker side – and come to terms with the fact that he never knew the real Sara." / "Hell-bent on exacting revenge and proving he was framed for his sister's murder, Álex sets out to unearth..."
Source [2]: "Hell-bent on exacting revenge and proving he was framed for his sister's murder, Álex sets out to unearth much more than the crime's real culprit."
Source [3]: "Who Killed Sara? (2021~2022) ... Season 1: 2021년 3월 18일 Season 2: 2021년 5월 19일 Season 3: 2022년 5월 18일 ... Genre: Crime, Thriller, Mystery, Melodrama ... Cast: José Ignacio Valenzuela, Manola Cardona, Hines Millow, Carolina Miranda..." (Note: The Korean text mentions José Ignacio Valenzuela as creator/producer/writer? Actually, it says "제작 호세 이그나시오 발렌수엘라" which means produced by... or written by... but I will stick to the facts).
Source [4]: Irrelevant (about "The Killing").
Overview (Target 160-220 words):
The provided text is extremely sparse.
Source 1/2: Álex is hell-bent on exacting revenge and proving he was framed for his sister Sara's murder. He sets out to unearth much more than the crime's real culprit. To achieve this revenge, Álex must bring to light the darker side of his sister and come to terms with the fact that he never truly knew the real Sara.
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