係
ケイ, かか.る, かかり, がかり, かか.わる

person in charge, connection, duty, concern oneself

JLPT3 G3 S9 F232

系# connection + 人 person (→ human agency) → *connect*; *link*; *lineage*; *relation* → *affect*; *modify* (a verb). *Person in charge* is via reinterpretation of the constituent elements of this character.

[Full Kanji Etymology List]