The lead got into her/his own story. But In Lost Romance, it was the FL and her work is a novel; the FL got into a novel. While in Unexpected, it was the ML and his work is a manhua; the ML got into a manhua. Both are antagonists inside their own story and try to change their own fate. And nearing the ending, FL in Lost Romance and ML in Unexpected got amnesia, but then remember their other half.