He was previously America Singer's secret boyfriend.
After America was picked for the Selection, he was drafted into the army where he earned top honors in his class, and was then promoted to be a member of the Royal Guard at the palace. Aspen spent his childhood with America's older brother, Kota.
Their eyes met when they unloaded a box, and they fell in love.
America later said that they kept purposely touching each other, and then saying quiet sorry's to each other.
When America took her selection form to the provincial office, she heard from his mother, Lena, that Aspen was saving up to marry someone.In the end of the book, Aspen and Lucy kiss in front of America, so she finally realizes and happily accepts their relationship.Aspen becomes a general somewhere in between The One and this book,and seems to have a pretty good relationship with Eadlyn Schreave ,who can depend on him to do many things for her.At midnight, she saw him climbing up into the tree house and she went in after him.While in there, they both started talking about how they felt about each other and they were both relieved and happy that they felt the same way.
At some point during The One, Aspen fell in love with Lucy, and Lucy fell in love with him.