Chương 20: Bổn thái tử chính là nhân chứng

Here's a thinking process:

1. **Analyze User Request:**

- **Task:** Edit/rewrite a provided Vietnamese text (fan fiction / xianxia style).

- **Constraints:**

- Keep original line count (don't add/remove lines)

- Novel style (tiểu thuyết)

- Fix machine translation errors

- Properly capitalize proper nouns

- No adding/removing content/meaning

- No markdown

- No explanations

- **Input Text:** A Vietnamese passage with machine translation issues, inconsistent names, awkward phrasing, etc.

2. **Analyze the Input Text:**

- I need to count the lines first to preserve line count.

- Let me break down the input into lines, identifying line breaks. The user provided a block of text. I need to parse it carefully.

- Looking at the input, it seems like paragraphs, but the constraint says "keep original line count". I need to figure out how many lines there are. Usually in these prompts, "line" means each line of text separated by Enter. Let me count the paragraphs/lines as they appear.

- Actually, the input is given as a continuous block, but I should treat each sentence or line as separated by natural line breaks. Wait, the prompt says "Chỉnh sửa plain text tiếng Việt, giữ nguyên số dòng." This means I must output the same number of lines as the input has. I need to count the lines in the input.

- Let me re-examine the input structure. It's pasted as one big paragraph, but there might be implicit line breaks. I'll assume each line is separated by a newline. Since it's pasted without visible newlines, I might need to infer or count sentences/segments. Actually, in many such tasks, the AI is expected to output the same number of lines as the input has paragraphs or sentences on separate lines. I need to be careful.

- Let me count the lines by looking at the input text. I'll split by natural breaks or assume each sentence is a line? No, "số dòng" means line count. I'll count the lines as they appear if I were to format it. Since it's given as a block, I might need to preserve the exact line breaks. But there are no explicit line breaks shown except maybe I need to count paragraphs.

- Wait, the prompt says "KHÔNG thêm/bớt ý, KHÔNG markdown, KHÔNG giải thích." and "giữ nguyên số dòng". This is critical. I need to output exactly the same number of lines as the input. I'll count the lines in the input by copying it mentally or analyzing the structure.

- Let me look at the input text carefully. It starts with "chẳng qua bát thái tử..." and ends with "không thấy.