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We consider the di-photon signal arises from two bunches of collimated photonjets emitting from a pair of highly boosted scalars. Following the discussionof detecting the photon jets at the collider, we extend the two-Higgs-doubletmodel (2HDM) by adding a gauge singlet scalar. To explain the di-photon excesswhich is recently observed at the first 13 TeV run of the LHC, the mixingbetween the heavy doublet state and the newly added singlet is cruciallyneeded. After the mixing, one can have a heavy Higgs state $Y_2$ at 750 GeV anda very singlet-like scalar $Y_1$ of sub-GeV, which would be highly boostedthrough the $Y_2$ decay. Both real singlet and complex singlet extension arestudied. It turns out that only the complex model can yield the 1-10 fb crosssection in the di-photon final state in accompany with the decay length of theorder of 1 m for the $Y_1$. This complex model parametrically predicts thewidth of 750 GeV resonance $\gtrsim 1$ GeV. In addition, the pseudoscalarcomponent of the singlet in this model is naturally stable and hence could be adark matter candidate.

Boosted scalar confronting 750 GeV di-photon excess