Genius Son, Mysterious Mom

After being drugged and left on a suitor's bed by her stepmother and sister, Su Li escapes and is rescued by Li Bei. Soon after, she discovers she's pregnant, but learns that her mother's death was caused by Li Bei. Six years later, she returns with her son, disguised as a cleaner at Li Bei's company, seeking revenge for her mother. However, during her search for evidence, she uncovers new truths.