Complex sentence: It's also mentioned the Gae In reminded Jin Ho of his mother, where although he loved her the most, she is also the one who causes him the most pain, implying that Gae In is also doing the same by caring for her ex-boyfriend.
Split into simpler sentences: It's also mentioned the Gae In reminder Jin Ho of his mother, where although he loved her the most, she is also the one who causes him the most pain. Implying that Gae In is also doing the same by caring for her ex-boyfriend.