李 (Lǐ) is one of the three most common Chinese surnames (with
王 Wáng and
张 Zhāng) and also the standard Mandarin rendering of the Korean surname 이 (I/Lee).
志焕 is a masculine given name combining
志 ('aspiration / will') and
焕 ('radiant / glowing'). In K-drama subtitles,
李志焕 typically transliterates 이지환 (Lee Ji-hwan).