The leading man, in both dramas, is sought after by many women but he show zero interest in any, until he meets the leading lady, who is like a breath of fresh air. The leading lady, in both dramas, are adorable, energetic, and independent.
The leading man is decisive and is the pursuer. Since the leading men in both are irresistible, the leading ladies fall easily for their good looks and charm.
Even though Love O2O is not a fantasy drama, it does have a fantasy element, with the video game they play. The game element also allows this modern day drama to include a bit of the traditional Chinese clothing and hair styles.
Main differences: Be aware that in The Eternal Love there are some really cheesy special effects.The Eternal Love has a backdrop of Royal politics/Sorcery.
Love O2O has a back drop of social media/College-life/business.