Nowadays, Physics is on a whole other level, necessitating more complicated theories and experimental instruments. After successful predictions, such as the Higgs boson and the direct observation of gravitational waves, fundamental questions about our surroundings are still arising, often leading to searches for new physics theories. In fundamental particle physics, a large community of physicists are investigating in searches for physics beyond the so called Standard Model (SM). Clearly, the SM cannot be a theory of everything but is probably not incorrect, since its predictions were accurately observed many times. Today, theoretical physicists have come with a large amount of potential theories for the extension of the SM, sometimes predicting new undiscovered particles. One of these is the so called 2HDM+S, an elegant theory that can solve many open questions. On the other hand, experimentalists are digging in the available data, trying to test the predicted theories. In this talk, the 2HDM+S model, exotic decay of the Higgs boson, and the search for a new boson at the LHC will be discussed.