It appears that the South Korean constitution has a few provisions relating to legislative immunity:
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Article 44
1. During the sessions of the National Assembly, no member of the National Assembly shall be arrested or detained without the consent of the National Assembly except in case of flagrante delicto.
2. In case of apprehension or detention of a member of the National Assembly prior to the opening of a session, such member shall be released during the session upon the request of the National Assembly, except in case of flagrante delicto.
Article 45
No member of the National Assembly shall be held responsible outside the National Assembly for opinions officially expressed or votes cast in the Assembly.
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(from https://www.constituteproject.org/constitution/Republic_of_K... linked elsewhere in this thread; "flagrante delicto" is a legal term of art for "being caught in the act". These provisions are similar to ones found in Article I section 6 of the US constitution.).
Edit to give additional credit where it's due:
According to the US Library of Congress, the US Speech or Debate clause is derived from a similar provision in the English Bill of Rights of 1689 and was adopted as part of the US constitution without much discussion.
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Article 44
1. During the sessions of the National Assembly, no member of the National Assembly shall be arrested or detained without the consent of the National Assembly except in case of flagrante delicto.
2. In case of apprehension or detention of a member of the National Assembly prior to the opening of a session, such member shall be released during the session upon the request of the National Assembly, except in case of flagrante delicto.
Article 45
No member of the National Assembly shall be held responsible outside the National Assembly for opinions officially expressed or votes cast in the Assembly.
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(from https://www.constituteproject.org/constitution/Republic_of_K... linked elsewhere in this thread; "flagrante delicto" is a legal term of art for "being caught in the act". These provisions are similar to ones found in Article I section 6 of the US constitution.).
Edit to give additional credit where it's due:
According to the US Library of Congress, the US Speech or Debate clause is derived from a similar provision in the English Bill of Rights of 1689 and was adopted as part of the US constitution without much discussion.
https://constitution.congress.gov/browse/essay/artI-S6-C1-3-...
https://en.wikipedia.org/wiki/Bill_of_Rights_1689