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Active galactic nuclei (AGNs) show a correlation between the size of thebroad line region (BLR) and the monochromatic continuum luminosity at 5100 \AA,allowing black hole mass estimation based on single-epoch spectra. However, thevalidity of the correlation is yet to be clearly tested for high-luminosityAGNs. We present the first reverberation-mapping results of the Seoul NationalUniversity AGN monitoring program (SAMP), which is designed to focus onluminous AGNs for probing the high end of the size-luminosity relation. Wereport time lag measurements of two AGNs, namely, 2MASS J10261389+5237510 andSDSS J161911.24+501109.2, using the light curves obtained over a $\sim$1000 dayperiod with an average cadence of $\sim$10 and $\sim$20 days, respectively forphotometry and spectroscopy monitoring. Based on a cross-correlation analysisand H$\beta$ line width measurements, we determine the H$\beta$ lag as$41.8^{+4.9}_{-6.0}$ and $52.6^{+17.6}_{-14.7}$ days in the observed-frame, andblack hole mass as $3.65^{+0.49}_{-0.57} \times 10^7 M_{\odot}$ and$23.02^{+7.81}_{-6.56} \times 10^7 M_{\odot}$, respectively for 2MASS J1026 andSDSS J1619.

The Seoul National University AGN monitoring project. II. BLR size and black hole mass of two AGNs