 Ahn submitted an application to the Seoul Family Court on September 9, 2019 for divorce against Ku, and it was delivered to Ku on September 18, 2019.On September 1, 2019, Ku revealed in Instagram post that she would be taking a break from the entertainment industry to resume college.Molecular graph

In chemical graph theory and in mathematical chemistry, a molecular graph or chemical graph is a representation of the structural formula of a chemical compound in terms of graph theory.