i think this must be an error so hurry and book it. Google flights aren't showing prices for china eastern or air china so play with dates.
Use Expedia [expedia.com]
or Priceline [priceline.com]
for travel period January - March 2018. Use "flexible dates" on priceline and it will pull up other dates.
edit: nvmd about china eastern....looks like they fixed the price.