Sierra Antonella Salazar has always known that she is destined to become an astronaut just like her father. Determined to follow in his footsteps, she is ready to defy gravity just to achieve her dream. When she's selected as one of the lucky students to enroll in the International Space Exploration University (ISEU), everything seems to be going well until she meets Mesias Donovan Gianluca, a man who seemingly has it all---good looks, brain, wealth, and a burning ambition to become an aerospace engineer. Sierra Antonella firmly promises herself not to let any distractions hinder her from fulfilling her promise to her family, not even the most handsome man at ISEU. However, even she finds it hard to resist Mesias Donovan's teasing and playful attitude, which never fails to get under her skin. Mesias Donovan, on the other hand, is determined to challenge the walls she has built around herself and test her limits. As they strive to achieve their dreams of becoming astronauts, they slowly discover that the journey is not a one-way street. They uncover the secrets that lie at the heart of the universe and potential human evolution. Terrestrial phenomena and incidents draw them deeper into a love that follows its own laws. The laws of their gravity.